*{
    padding: 0;
    margin: 0;
}



.box{
    background-image: url('https://img0.baidu.com/it/u=1533502861,638750535&fm=253&fmt=auto&app=120&f=JPEG?w=1422&h=800');
    background-size: cover;
    width: 100vw;
    height: 100vh;
    position: relative;
}
.box1{
    background-color: white;
    width: 20vw;
    height: 50vh;
    box-shadow: 0 0 5px skyblue;
    border-radius: 20px;
    position: absolute;
    left: 50vw;
    top: 50vh;
    margin-left: -10vw;
    margin-top: -25vh;
    opacity: 0.8;
    box-sizing: border-box;
    padding: 20px;
}
.box2{
    display: flex;
    margin-top: 20px;
    align-items: center;
}
.box2>div{
    margin-left: 20px;
    cursor: pointer;
}
.box3{
    font-size: 20px;
    font-weight: bolder;
}
.box4{
    margin-top: 40px;
}



.h3{
    text-align: center;
}



.input{
    width: 18vw;
    border-radius: 20px;
    border: 2px solid black;
}



.button{
    width: 18vw;
    border-radius: 20px;
}



.span{
    margin-left: 9vw;
    cursor: pointer;
}